1143005491 has 2 divisors, whose sum is σ = 1143005492. Its totient is φ = 1143005490.

The previous prime is 1143005467. The next prime is 1143005561. The reversal of 1143005491 is 1945003411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1143005491 - 2⁵ = 1143005459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143005431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571502745 + 571502746.

It is an arithmetic number, because the mean of its divisors is an integer number (571502746).

Almost surely, 2^1143005491 is an apocalyptic number.

1143005491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143005491 is an equidigital number, since it uses as much as digits as its factorization.

1143005491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1143005491 is about 33808.3642165663. The cubic root of 1143005491 is about 1045.5611527927.

The spelling of 1143005491 in words is "one billion, one hundred forty-three million, five thousand, four hundred ninety-one".